@mrahman4 called this "satire." I call it TRUTH! Actually, the understatement of the universe. Far MORE than 80% of the people use far FEWER than 20% of the features.
Organize, organize, organize.
When dealing with hoarding, the solution is usually a combination of purging and organization.
Almost definitely, you need less content. But you need to keep some of it. Sometimes what you need to keep is still a lot of stuff. And you need to organize it well - not just dump everything on one page.
Good organization promotes usability and usefulness AND improves SEO, compared to the "dump everything on one page" method.